An extrapolation method to determine the effective notch stress in circular hollow section X-joints

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• 作者：M. R. Pradana ; X. Qian ; S. Swaddiwudhipong and W. Shen
• 刊名：Fatigue & Fracture of Engineering Materials & Structures
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：40
• 期：2
• 页码：160-175
• 全文大小：2491K
• ISSN：1460-2695

文摘

This paper presents an extrapolation method to determine the effective notch stress (ENS) on the weld toes of welded circular hollow section (CHS) X-joints in-line with the extrapolation method to determine the structural hot-spot stress in existing design guidelines. This investigation verifies and extends the recently proposed ENS extrapolation scheme to CHS X-joints, which elevates significantly the difficulty in generating a weld toe radius along the brace-to-chord intersection as required in existing guidelines. An extensive numerical study then investigates the ENS extrapolation for CHS X-joints under three loading conditions, namely, the brace axial load, the brace in-plane bending load, and the brace out-of-plane bending load. The numerical study derives a set of recommended extrapolation parameters that ensures accurate ENS estimation for each loading condition. This paper demonstrates that the proposed extrapolation method for the CHS X-joints yields good agreement with the standard ENS calculation procedure described in the International Institute of Welding (IIW) guideline.